Rotary kiln and the like



24, 1931. FASTING 1,793,471-

ROTARY KILN Am; THE LIKE Filed Sept. 19, 1929 I I BY I V v I M AW shall be promoted. Y

I tally, thechains which are so' arranged will Pa tented Feb. 24, .iesi

' UNI-TED. STATES PATENT orrlcu mm s. rasrnve, or vAnnY, NEAR cornnnaenn, DENMARK, AssIeNon' '20 r. smm'n & (20., or vnw YORK, 1:. Y., A conrom'rron on NEW JERSEY ROTARY KILN AN D THE LIKE Application filed September 19, 1929, Serial No. 393,614, and. in Great Britain January 24, 1929. i

' In the operation of rotarykilns for the burning of slurry-like material, such as cement slurry inthe manufacture of cement, the transfer of heat from the hot'products of 5 combustion to the slurry and the subsequent drying of the slurry, preliminary to ,calci nation, in that portion of the kiln adjacent to the end at which the slurry is admitted, has been promoted by the suspensionof a net zone orportion of the kiln; In the rotation of the kiln such chains, .heated'during their passage through the space above the slurry, are immersed in the slurry during a part of the rotation and give up their heat to the slurry. The slurry, which is a somewhat sticky mass, also adheres to the chains and is raisedwith the chains, as they emerge from the body ofthe slurry into the path ofthe" products of combustion. It has been found in the practical operation of {rotary kilns equipped as heretofore with such chains the forward movement of the slurry from. theinlet end of the kiln toward the outlet thereof is retardedto an. undesirable extent. It has, therefore, been the objectofthe present invention to provide for such arrangement of.

the chains in the kiln that, "WltllOllt diminishing their effectiveness in promoting the drying of the slurry, the forward movement of the slurry toward the outletend of the kiln In accordance with the invention the chains arearranged in groups and the chains of each group are so arranged-that as they emerge from .the slurry, their movement, they form a warped" surface, the lower part "of which, as it emergesfrom the slurry, slopes toward the outlet end of the kiln. Each such warped surface raises a portion of the slurry from the mass at the bottom and its slope to ward the outlet end of the kiln acts .with something of the same effect which a solid scoop would have, urging the slurry forward toward the outlet end of thekiln. Incidenwork of (chains. within the corresponding every other group and does not interfere in any manner wlth the operation of any other group. The formation of the warped surlength toward the outlet end of the kiln, also as hereinafter described.

The invention will be more fully explained withreference to the accompanying drawing. 1n which several embodiments of the inven-' Y tion are illustrated, necessarilyin a some- 7 ,what schematic manner, and in which:

Figure 1 is a view in transverse section of a kiln equipped with chains-of equal length the improved. arrangement, the plane of section being indicated by the broken line 1-1 ofFigure2. I V

Figure 2 is aview of; a portion of the kiln, as seen from above, with" three successive groups of chains 'in the described relation,

thewall of the kiln being partly broken away and partly shown in section.

Figure 3 is'a view similar to Figure 1' but illustrating, as far'as may be necessary, the glrl'ouping together of threeseveral groups of c ains.

v Figure 4 is a view similar to Figure 2, but

illustrating the arrangement of chains shown in Figure 3.

Figure 5 is a view similar to Figures 1 and 2, but illustratinga different arrangement of the points of attachment of the chains to the kiln, with the chains progressively increasing in length-toward theoutlet end.

Figure 6 is a view similar to Figures 2 and 4,but showing thechains arranged as indicated in Figure 5.

Figure 7 is a view in side elevation, illustrating the arrangement of the chains as.

shown in Figures 5 and 6.

In Figures 1, and 5 the arrow indicates the direction of rotation of the kiln and in Figures 2, 4,6 and Tthe arrows in line with 5 the axes of the kilns indicate direction tohave, as they lie on the bottom of-the kiln beward the outlet end of the kiln.

In theembodiments of the invention illusfore they emerge fromthe slurry, a tendency to'urge forward the whole mass of slurry.

'trated in' th'e dra i g it is assumed that the Each group of chains acts independently of; chains are arranged in sets, each set con the kiln at points which are distributed' longitudinally as well as peripherally, so that the chains have a roughly helical arrangement, as shown in Figure 2, or'the several groups may be brought together in one gen-.

eral group with each chain lying in a substantially transverse plane, as shown in Figures 4, 6 and 7.

The several chains of each group may be of equal length, as represented 'in Figures 1,

2, 3 and 4, or they may be of unequal length,

progressively longer toward the outlet end of the kiln, as represented in Figures 5, 6

and 7. If the chains of each group are of the same length the result desired is accomplished by securing the ends of the several chains of each group to the kiln atv-points which are distributed both in a peripheral direction and in a longitudinal direction with respect to the axis of the kiln. On the other hand, if the chains are of unequal length, being progressively longer toward the outlet end of the kiln, the chains of each group may be secured to the ln'ln in lines parallel with the axis and without peripheral distribution.

In the embodiment of the invention illustrated in, Figures 1 and 2 the chains are shown as arranged in three groups a, b and e 0 and the ends of the chains of each as secured to the kiln at points d, e and f. The five points of attachment in each group are distributed or displaced relatively to each other, not only in longitudinal direction,with,

respect to the axis of the kiln, but ina pe= ripheral direction, as shown in Figure 2. The effect of this arrangement of the points of suspension of each group ina helical line 'is that the chains of eachgroup, as at a and b, as they hang from the top, as shown in Figure 1-, form a loosely'hanging curtain or' warped surface, between the points 6, f and ,e, d, while the chains of the group a lie on the bottomof the kiln in lines, as indi cated' in Figure2. When the kiln is rotated 'ward the outlet end of the kiln, thus urgin A the slurry toward the outlet end of the kiln.

in the direction indicated by the arrow, Fig. 1, thechains of the group b, which have been immersed in the slurry and emerged from it, hang in such a position that the lower part of the warped surface, formed by the group. of chains, slopes forward or to- The chains of the group -a, which have emerged from the slurry andare again about to be immersed in "the slurry, transferring heat from the hot products of combustion above the slurry in the kiln to the slurry in the lower part of the kiln, also form a warped surface but with the lower part of such warped surface sloping in the opposite direction, that is, toward the inlet end of the kiln,'but in this case the sloping part of the warped surface has no effect upon the movement of the slurry. The chains of the group 0, passing through the slurry in the lower part of the kiln, have a tendency to arrange them-- selves along a roughly helical line and in the rotation of the kiln tend to sweep the slurry forward toward the outlet end of the ln'ln.

The embodiment of the invention I illustrated in Figures 3 and 4 issubstantially the same as that illustrated in Figures 1 and 2, except that-the three groups a b and 0 of the chains and their points of attachment 11 e and f are brought together-so that the chains of each' group of the three several groups lie in peripheral lines, while the points of attachment of the chains of each group are distributed or displaced both longitudinally, with respect to the axis of the kiln, and peripherally, the chains of each group being ofthe same length. V

It will be obvious that the formation of the loosely hanging curtain with a warped surface, which is necessary to urge the slurry forward in the kiln as each group rises from its lowest position to its highest position, may also be accomplished by securmg the ends'of the chains of each group 11 b and 0 to the kiln at'points, as 'at 6 d and f which are distributed or displaced longiltudinally, with respect to the axis of the as. shown in Figur parallel with the axis of-the kiln, the points not being distributed or displaced with respect toeach other in a peripheral direction, but if the chains are thus arranged the chains of each group must be progressively longer'toward the outlet end of'the kiln-in order that the chains may form. a loosely hanging curtain with a warped surface, the

lower portion of which slopes toward the es 5, 6 and 7., but in lines outlet end of the kiln as each-group ri ses from its lowest position. I In Figures 5, 6 and 7 the chains of each group are shown as' lying in transverse planes, with several groups massedto form v a general group.

It will be obvious that the chains may be secured to the kiln in any convenient man.- ner and that they may be arranged in differentways to suit the conditions of opera-v tion, provided the formation of the loose curtain with a warped surface is accomplished; It will also be obvious that the ing ,vention maybe applied to other purposes than the treatment of cement slurry.

I claim as my invention:

" '1. Inxan apparatus of he character described the combination ofa. rotating shell and groups, of slack chains secured at their ends to the interior ofthe shell, each group forming a loosely hung curtain with a warped surface, the lower part of which, as the group rises in the rotation of the shell, slopes toward the outlet end of the shell to urge the material .in the shell-toward the outlet end.

2. In an apparatus of the character described the combination of a rotating shell and groups of slack chains secured at their .ends to the interior of the shell, the chains of each grou being of the same length and the points 0 attachment of the chains of each group to the shell being distributed in a longitudinal direction with respect to the axis of the shell and in a peripheral direction, each group forming a loosely hung curtain with 'a warped surface, the lower part of which, as the group rises in the rotation of the shell, slopes toward the outlet end of.

the shell to urge the material in the shell toward the outlet end.

This a plication signed this 31st day of August D. 1929.

JOHAN S. FASTING. 

